| Summary: | 碩士 === 國立成功大學 === 機械工程學系 === 103 === This work uses finite different time domain method with design of experiments to explore factors which impact wide-band radiative property of rough surface by numerical experiments. First, in order to reduce computing time of finite different time domain method for the following discussion, use the message passing interface library to build a parallel computing program. In contrast to the serial computing program, the parallel computing program reduces over 40% computing time. Wavelengths of numerical experiments are 1 m, 54.545 mm and 632 nm. For this three wavelengths, explore factor treatments and screen significant factors. The radiative property of wavelength 1 m experiment is the function estimates backscattering enhancement which is builded by ourselves. However, we aim at reflectivity at wavelength 54.545 mm and 632 nm experiments, and then try to find the local minimum reflectivity and combinations of factor at wavelength 632 nm by central composite design. In factor screening experiments, use F test to screen significant factors in the regression model of response variables. In central composite design, the location of stationary point isn’t at range of experiment. So, use the method of steepest scape to approach the vicinity of optimum. After experiments, find the trend of reflectivity is still monotonically decreasing.
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